Systematic revision of the Argentinean genus Thylacoderes solier (Coleoptera: Tenebrionidae), with descriptions of two new species

The genus Thylacoderes Solier (Pimeliinae: Praocini), distributed in central and northern Argentina, is revised. A Cladistic analysis of four species is presented including: Thylacoderes sphaericus n. sp., T. seminulum (Burmeister), T. eumolpioides Solier, and T. costatus n. sp. A lectotype is designated for Platyholmus seminulum Burmeister. The cladistic analysis shows that Thylacoderes comprises a natural group of species, characterized by several synapomorphies from the external morphology and male genitalia. A redescription of the genus, redescriptions or descriptions of the four species, a key, illustrations of external morphology, internal skeletal anatomy and genitalic features, a cladogram, and a distribution map are included.